Sheave wheel



June 26, 1923.

T. S. MILLER SHEAVE WHEEL Filed Dec. 11. 1922 IN V EN TOR.

A TTORNEYS Patented June 26, 1923 UNITED STATES THOMAS SPENCER MILLER, OF SOUTH ORANGE, NEW JERSEY.

SHEAVE WHEEL.

Application filed December-11, 1922. Serial No. 606,039.

To all w ham it may concern:

Be it known that I, THOMAS SPENCER MILLER, a citizen of the United States, and resident of South Orange, in the county of Essex and State of New Jersey, have invented new and useful Improvements in Sheave lVheels, of which the following is a specification.

My invention consists of certain novel parts and combinations particularly pointed out in the claims.

The following is a description of a sheave wheel embodying my invention in a form at present preferred by me, but it will be understood that various modifications and changes may be made therein without departing from the spirit of my invention and without exceeding the scope of my claims.

In the drawings which are to be taken as part of this specification, Fig. 1 is a view partly in section ofan illustrative form of my improved device showing a cable in place; Fig. 2 is a view looking from one side of Fig. 1 with part of the hoop and cable cut away. Fig. 3 is an example of the application of my invention to a cable-way carriage.

Referring to Figs. 1 and 2, sheave wheel 1, is provided with a slot or groove 2, in which is adapted to be placed a hoop 3. The relative size of the parts is such that the hoop makes a running fit or rides in the groove and at the same time affords a bearing surface in common with sheave 1 for cable 4. The hoop, preferably is of a larger diameter than the. sheave permitting the former to be put in place without requiring that the sheave be made of detachable parts.

It is a familiar fact that a sheave wheel on main cable should be of generous diameter in o'rder that the bend in the cable itself will not be too short. The largerthe diameter of the sheave wheel the longer will be the life of the sheave and of the cable. Large sheaves however are objectionable on account of their weight and cost. Small sheaves on the other hand are objectionable because of the short life to both cable and the sheave Wheels. By my invention I am able to obtain the advantages of both and the disadvantages of neither. In other words, my improved sheave has the size and cheapness of a small Wheel but affords a bearing surface and radius of curvature of a large one.

A. further advantage of my invention lies in the use of a hoop of harder or greater wear-resisting material than the sheave thus enabling the sheave to be made of less eX- pensive material thereby achieving considerable economy.

In Fig. 3, I have shown my improved sheave wheel as applied to a cable way carriage. In this embodiment the carriage 10 is suspended upon cable 4 by means of sheaves 1, 1. and is moved in either direction along cable 4 by means of cables 11 and 12. Cable 12 also operates tongs 13 through pulley 14 attached to carriage 10.

II- hile preferably I provide a hoop narrower than the cable groove of the sheave and riding in a slot cut into the cable groove, it will be understood that this is not essential. The groove 2 may be dispensed with and the hoop 3 will then rest directly on the bottom of the cable groove.

I claim 1. In an apparatus of the class described, a sheave, a groove in the cable groove in said sheave and a hoop adapted to ride .in said groove and bear against the cable.

2. In an apparatus of the class described, a sheave, a groove in the-cable groove in said sheave and a hoop of larger diameter than said sheave and adapted to ride in said groove and bear against the cable.

3. In an apparatus of the class described, a sheave and a hoop of larger diameter than the cable groove in said sheave and riding in said cable groove and adapted to form a bearing surface on the cable.

a. In an apparatus of the class described, a sheave and a. hoop of larger diameter than the cable groove in said sheave and riding in said cable groove and adapted to form a-bearing surface on the cable, said hoop being of a harder material than said sheave.

THOMAS SPENCER MILLER. 

